Duduma Sunglasses via Amazon offers its Duduma Unisex Polarized Rectangle Sports Sunglasses in Silver for $24.99. Coupon code "KHQA838D" cuts that to $7. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.58.) That's $23 off and the lowest total price we could find. Features include 100% UVA and UVB protection and a Tr603 bendable composite frame that's purportedly unbreakable. They come with a hard case, soft pouch, and cleaning cloth.